[GreenKeys] Mod 28 Gearing

Mon Aug 12 10:41:53 EDT 2019

I don't have an answer, I was lucky back in the day that all the 
equipment I had came from the same source and was all 7.42.

Jim has posted the story of how we got 7.42.  WU made some of their own 
machines at one time and then there was Kleinschmidt as well.  You can 
read documents that infer that the government was buying both 7.00 and 
7.42 versions of the same models.

John, W9DDD
Ich habe dreimal abgeschnitten uns jetzt zu kurtz. (I cut it off 3 times 
and it's still too short.)

On 8/12/2019 9:33 AM, Steve Garrison wrote:
> Thanks John, great information to have!
> 
> I'm still puzzled as why there was more than one "standard."
> 
> Especially the 7.00.  And the 7.42 & 7.50 are so close (0.08") why bother?
> 
> Steve G./N4TTY
> 
> -----Original Message-----
> From: John, W9DDD <w9ddd at tapr.org>
> Sent: Monday, August 12, 2019 10:23 AM
> To: Steve Garrison <steve.n4tty at gmail.com>; greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] Mod 28 Gearing
> 
> Hi Steve,
> 
> For some reason Teletype documentation doesn't tell us the number of teeth
> on the 3 different keyboard/gear spindle.  (that I've been able to
> find.)
> 
> I got that information from a chart that is part of this article:
> http://navy-radio.com/manuals/tty/Military_M28_Gears.pdf
> 
> Bear in mind that the gears on the tying unit change for 7.00 and 7.50 vs.
> the more standard 7.42.
> 
> I got into researching this when I found I couldn't swap typing units
> between keyboards.  Turned out one pair was 7.42 and the other a 7.00.
> 
> John, W9DDD
> Ich habe dreimal abgeschnitten uns jetzt zu kurtz. (I cut it off 3 times and
> it's still too short.)
> 
> On 8/12/2019 9:02 AM, Steve Garrison wrote:
>> Are your numbers correct John?  It seems like the number of teeth for
>> 7.42 would be between the number of teeth for 7.00 and 7.50. Or am I
>> just not understanding the gearing?
>>
>> Steve G./N4TTY
>>
>> -----Original Message-----
>> From: greenkeys-bounces at mailman.qth.net
>> <greenkeys-bounces at mailman.qth.net>
>> On Behalf Of John, W9DDD
>> Sent: Monday, August 12, 2019 9:25 AM
>> To: greenkeys at mailman.qth.net
>> Subject: Re: [GreenKeys] Mod 28 Gearing
>>
>> Count the teeth on the keyboard gear.
>>
>> 24 teeth - 7.42
>> 28 teeth - 7.00
>> 30 teeth - 7.50
>>
>> John, W9DDD
>> Ich habe dreimal abgeschnitten uns jetzt zu kurtz. (I cut it off 3
>> times and it's still too short.)
>>
>> On 8/12/2019 8:20 AM, Steve Garrison wrote:
>>> Good point Nick.  The keyboard is what generates the signals, the
>>> magnets on the printer just respond to whatever they receive.
>>>
>>> Steve G./N4TTY
>>>
>>> *From:* greenkeys-bounces at mailman.qth.net
>>> <greenkeys-bounces at mailman.qth.net> *On Behalf Of *Nick England
>>> *Sent:* Monday, August 12, 2019 5:50 AM
>>> *To:* John Lawson <john at tubetestingpros.com>
>>> *Cc:* greenkeys at mailman.qth.net
>>> *Subject:* Re: [GreenKeys] Mod 28 Gearing
>>>
>>> BIG question is the keyboard. Is it 7.00 or 7.42??
>>>
>>> On Sun, Aug 11, 2019 at 11:36 PM John Lawson
>>> <john at tubetestingpros.com <mailto:john at tubetestingpros.com>> wrote:
>>>
>>>
>>>       Greetings Greenkeys!
>>>
>>>       I'm about to order a set of gears for the Tempest Mod 28, which I am
>>>       told - (how to verify?) is a 75wpm machine. [hmmmm mebbe it ain't -
>>>       best
>>>       go check...]
>>>
>>>       Tom Tillson kindly sent a chart summarizing the gearsets for the
> 28s,
>>>       KSR and ASR.
>>>
>>>       Of course my goal is to send and copy RTTY at 45 baud with this 28.
>>>       It's
>>>       a KSR so no re-perf or td.
>>>
>>>
>>>       So, from the chart, there is gearing for 65wpm - 390 opm, 45.5 baud,
>>>       7.00 unit code. There is a motor pinion and the driven gear.
>>>
>>>       Keyboard (LAK)  gearset 173795   consisting of:
>>>
>>>       Gears:     173794 14 tooth
>>>
>>>                          173793 100 tooth
>>>
>>>       Isolator   159287
>>>
>>>       Posts       161301  (need 2)
>>>
>>>
>>>       Gearing for 60wpm - 368 opm, 45.5 baud. 7.42 unit code
>>>
>>>       Keyboard (LAK) gearset 161293  consisting of:
>>>
>>>       Gears:     159278  14 tooth
>>>
>>>                          159279  96 tooth
>>>
>>>       Isolator  159287 (same)
>>>
>>>       Posts      161301 (same)
>>>
>>>
>>>       Paul Cembura suggests  the 161293 / 45.5 / 7.42  set. I had
> originally
>>>       asked him for the 173795 / 45.5 / 7.42 set.
>>>
>>>
>>>       I understand a bit of the relationships involved - but in practical
>>>       terms - which is "better"??
>>>
>>>
>>>       Cheerz
>>>
>>>       John KB6SCO
>>>
>>>       Carson City NV
>>>
>>>
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>>>
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>>> www.navy-radio.com <http://www.navy-radio.com>
>>>
>>>
>>>
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>>
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>>
> 